Mouthpiece



FIG. 1 is a perspective view of a mouthpiece showing our new design.

FIG. 2 is a top view thereof.

FIG. 3 is a bottom view thereof.

FIG. 4 is a left side view thereof, with the right side view being a mirror image thereof; and,

FIG. 5 is a rear view thereof.

The broken lines shown in the Figures show portions of the mouthpiece that form no part of the claimed design. 

CLAIM The ornamental design for a mouthpiece, as shown and described. 